Fix incorrect rendering of concave quads from RWX models (like parch01.rwx) by tesselating them like other n-sided polygons

Fix loading of VPPTSV object group files with "inf" values in the RotationAngle field (this is used as a flag to signal that the Rotation X, Y and Z fields contain euler angles instead of an axis-angle rotation)

Fix loop not working for rotate command when time is specified without wait